Open Source Rust Emulators

Ruffle is an open-source emulator for Adobe Flash Player, written primarily in Rust, and targeted at both desktop applications and web browsers via WebAssembly. Its goal is to enable legacy Flash content—animations, games, interactive media—to continue running safely and reliably after official Flash support was discontinued. On the web side, Ruffle is embedded into pages or installed as a browser extension; in the desktop version, it can open .swf files directly or embed them in applications. Because it’s built with memory safety in mind, Ruffle helps avoid many of the security vulnerabilities that plagued classic Flash (buffer overflows, use-after-free, etc.). It strives to support multiple versions of ActionScript (1, 2 and parts of 3) and a wide swath of the Flash API so as much content as possible works unchanged.

Mooneye GB is a Game Boy research project and emulator written in Rust. The main goals of this project are accuracy and documentation. Some existing emulators are very accurate (Gambatte, BGB >= 1.5) but are not documented very clearly, so they are not that good references for emulator developers. I want this project to document as clearly as possible why certain behavior is emulated in a certain way. This also means writing a lot of test ROMs to figure out corner cases and precise behavior on real hardware. The emulator is lagging behind hardware research. I don't want to spend time making short-lived and probably incorrect fixes to the emulator if I'm not sure about the hardware behavior. On an i7-3770K desktop machine, I can usually run ROMs with 2000 - 4000% speed. Without optimizations, the speed drops to 150 - 200%, which is still fine for development purposes.